KUMON KUMON Why-Why Calendar 2026 Reiwa 8th Edition. Thank you very much. One question a day, a treasure trove of knowledge every day. Packed with fun "whys" about daily life, animals, plants, insects, dinosaurs, vehicles, the body, the Earth and space, history, inventions and discoveries, events, and words. Size (approx.): 26cm tall x 25cm wide